Upgrade the SettingsActivity to the PreferenceFragmentCompat.

Old SettingsActivity was deleted and replaced.
This upgrade fixes the bugs with DarkMode.

app/build.gradle

@@ -33,6 +33,7 @@ android {
 
 dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation 'androidx.preference:preference:1.1.0-rc01'
     testImplementation 'junit:junit:4.12'
     implementation 'androidx.core:core:1.2.0'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'

app/src/main/AndroidManifest.xml

@@ -2,15 +2,18 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.secuso.privacyfriendlysudoku.ui.view">
 
-    <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
 
     <application
+        android:name="org.secuso.privacyfriendlysudoku.SudokuApp"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
-        android:theme="@style/AppTheme"
+        android:theme="@style/AppTheme">
-        android:name="org.secuso.privacyfriendlysudoku.SudokuApp">
+        <activity
+            android:name=".SettingsActivity"
+            android:label="@string/title_activity_settings_new"></activity>
         <activity
             android:name="org.secuso.privacyfriendlysudoku.ui.SplashActivity"
             android:theme="@style/SplashTheme">
@@ -23,23 +26,19 @@
         <activity
             android:name="org.secuso.privacyfriendlysudoku.ui.MainActivity"
             android:label="@string/app_name"
-            android:theme="@style/AppTheme.NoActionBar">
+            android:theme="@style/AppTheme.NoActionBar"></activity>
-        </activity>
         <activity
             android:name="org.secuso.privacyfriendlysudoku.ui.TutorialActivity"
             android:label="@string/app_name"
-            android:theme="@style/AppTheme.NoActionBar">
+            android:theme="@style/AppTheme.NoActionBar"></activity>
-        </activity>
         <activity
             android:name="org.secuso.privacyfriendlysudoku.ui.DailySudokuActivity"
             android:label="@string/Sudoku"
-            android:theme="@style/AppTheme.NoActionBar">
+            android:theme="@style/AppTheme.NoActionBar"></activity>
-        </activity>
         <activity
             android:name="org.secuso.privacyfriendlysudoku.ui.CreateSudokuActivity"
             android:label="@string/Sudoku"
-            android:theme="@style/AppTheme.NoActionBar">
+            android:theme="@style/AppTheme.NoActionBar"></activity>
-        </activity>
         <activity
             android:name="org.secuso.privacyfriendlysudoku.ui.SettingsActivity"
             android:label="@string/title_activity_settings"
@@ -49,22 +48,24 @@
             android:label="@string/title_activity_game_view"
             android:launchMode="singleTask"
             android:theme="@style/AppTheme.NoActionBar">
-
+            <intent-filter>
-            <intent-filter >
                 <action android:name="android.intent.action.VIEW" />
+
                 <category android:name="android.intent.category.DEFAULT" />
                 <category android:name="android.intent.category.BROWSABLE" />
-                <data android:scheme="http"
+
-                      android:host="sudoku.secuso.org" />
+                <data
+                    android:host="sudoku.secuso.org"
+                    android:scheme="http" />
             </intent-filter>
-
+            <intent-filter>
-            <intent-filter >
                 <action android:name="android.intent.action.VIEW" />
+
                 <category android:name="android.intent.category.DEFAULT" />
                 <category android:name="android.intent.category.BROWSABLE" />
+
                 <data android:scheme="sudoku.secuso.org" />
             </intent-filter>
-
         </activity>
         <activity android:name="org.secuso.privacyfriendlysudoku.ui.AboutActivity" />
         <activity android:name="org.secuso.privacyfriendlysudoku.ui.LoadGameActivity" />
@@ -74,6 +75,7 @@
         <activity
             android:name="org.secuso.privacyfriendlysudoku.ui.HelpActivity"
             android:label="@string/title_activity_help" />
+
         <service
             android:name="org.secuso.privacyfriendlysudoku.controller.GeneratorService"
             android:enabled="true"

app/src/main/java/org/secuso/privacyfriendlysudoku/ui/SettingsActivity.java

@@ -1,109 +1,58 @@
-/*
- * qqwing - Sudoku solver and generator
- * Copyright (C) 2014 Stephen Ostermiller
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
 package org.secuso.privacyfriendlysudoku.ui;
 
-
-import android.annotation.TargetApi;
-import android.content.Context;
-import android.content.Intent;
 import android.content.SharedPreferences;
-import android.content.res.Configuration;
 import android.os.Build;
 import android.os.Bundle;
-import android.preference.ListPreference;
-import android.preference.Preference;
-import android.preference.PreferenceActivity;
-import androidx.appcompat.app.ActionBar;
-import androidx.appcompat.app.AppCompatDelegate;
-
 import android.preference.PreferenceFragment;
 import android.preference.PreferenceManager;
 import android.view.MenuItem;
-import android.view.View;
-import android.widget.CompoundButton;
-import android.widget.Switch;
 
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatDelegate;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceGroup;
+import androidx.preference.PreferenceScreen;
+
+import org.secuso.privacyfriendlysudoku.ui.SettingsActivity;
 import org.secuso.privacyfriendlysudoku.ui.view.R;
 
-import java.util.List;
+public class SettingsActivity extends AppCompatActivity {
-import java.util.Map;
 
-/**
- * A {@link PreferenceActivity} that presents a set of application settings. On
- * handset devices, settings are presented as a single list. On tablets,
- * settings are split by category, with category headers shown to the left of
- * the list of settings.
- * <p>
- * See <a href="http://developer.android.com/design/patterns/settings.html">
- * Android Design: Settings</a> for design guidelines and the <a
- * href="http://developer.android.com/guide/topics/ui/settings.html">Settings
- * API Guide</a> for more information on developing a Settings UI.
- *
- * The SettingsActivity is extended by AppCompatPreferenceActivity
- * The activity is responsible for the different app settings.
- */
 
-public class SettingsActivity extends AppCompatPreferenceActivity {
+    private static PreferenceScreen prefScreen;
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        setupActionBar();
 
-        overridePendingTransition(0, 0);
+    private static void recheckNightModeProperties(SharedPreferences sharedPreferences) {
 
-        View mainContent = findViewById(R.id.main_content);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
-        if (mainContent != null) {
+
-            mainContent.setAlpha(0);
+            if (sharedPreferences.getBoolean("pref_dark_mode_setting", false)) {
-            mainContent.animate().alpha(1).setDuration(BaseActivity.MAIN_CONTENT_FADEIN_DURATION);
+                prefScreen.findPreference("pref_dark_mode_automatically_by_system").setEnabled(false);
+                prefScreen.findPreference("pref_dark_mode_automatically_by_battery").setEnabled(false);
+            } else {
+                if (sharedPreferences.getBoolean("pref_dark_mode_automatically_by_battery", false) && sharedPreferences.getBoolean("pref_dark_mode_automatically_by_system", false) ) {
+                    sharedPreferences.edit().putBoolean("pref_dark_mode_automatically_by_battery", false).commit();
                 }
-        /**
-         * Set up the {@link android.app.ActionBar}, if the API is available.
-         */
 
-        SharedPreferences preferenceManager = PreferenceManager
+                prefScreen.findPreference("pref_dark_mode_automatically_by_system").setEnabled(!sharedPreferences.getBoolean("pref_dark_mode_automatically_by_battery", false));
-                .getDefaultSharedPreferences(this);
+                prefScreen.findPreference("pref_dark_mode_automatically_by_battery").setEnabled(!sharedPreferences.getBoolean("pref_dark_mode_automatically_by_system", false));
+            }}
 
-       SharedPreferences.OnSharedPreferenceChangeListener x = new SharedPreferences.OnSharedPreferenceChangeListener() {
-
-           /**
-            * Case differentiation for the different Night Mode options
-            * @param sharedPreferences
-            */
-
-           public void recheckNightModeProperties(SharedPreferences sharedPreferences){
         if (sharedPreferences.getBoolean("pref_dark_mode_setting", false )) {
             AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
-                   restartActivity();
 
         } else if (sharedPreferences.getBoolean("pref_dark_mode_automatically_by_system", false)) {
             AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
-                   restartActivity();
         } else if(sharedPreferences.getBoolean("pref_dark_mode_automatically_by_battery", false)){
             AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_AUTO_BATTERY);
-                   restartActivity();
         } else {
             AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
-                   restartActivity();
+        }
     }
 
-           }
+    static SharedPreferences.OnSharedPreferenceChangeListener x = new SharedPreferences.OnSharedPreferenceChangeListener() {
+
         @Override
         public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
             if (key.equals("pref_dark_mode_setting")|| key.equals("pref_dark_mode_automatically_by_system")||key.equals("pref_dark_mode_automatically_by_battery")) {
@@ -111,179 +60,46 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
             }
         }
     };
-        preferenceManager.registerOnSharedPreferenceChangeListener(x);
 
-    }
+    @Override
-
+    protected void onCreate(Bundle savedInstanceState) {
-    /**
+        super.onCreate(savedInstanceState);
-     * is responsible for closing and opening the activity
+        setContentView(R.layout.settings_activity);
-     */
+        getSupportFragmentManager()
-    public void restartActivity() {
+                .beginTransaction()
-        Intent i = new Intent(getApplicationContext(), MainActivity.class);
+                .replace(R.id.settings, new SettingsFragment())
-        recreate();
+                .commit();
-        finish();
-        startActivity(i);
-    }
-
-    private void setupActionBar () {
         ActionBar actionBar = getSupportActionBar();
         if (actionBar != null) {
-            // Show the Up button in the action bar.
             actionBar.setDisplayHomeAsUpEnabled(true);
         }
-    }
 
-    @Override
+        SharedPreferences preferenceManager = PreferenceManager
-    public boolean onMenuItemSelected(int featureId, MenuItem item) {
+                .getDefaultSharedPreferences(this);
-        int id = item.getItemId();
-        if (id == android.R.id.home) {
-            if (!super.onMenuItemSelected(featureId, item)) {
-                finish();
-                //NavUtils.navigateUpFromSameTask(this);
-            }
-            return true;
-        }
-        return super.onMenuItemSelected(featureId, item);
-    }
 
-    /**
+        preferenceManager.registerOnSharedPreferenceChangeListener(x);
-     * {@inheritDoc}
-     */
-    @Override
-    public boolean onIsMultiPane() {
-        return isXLargeTablet(this);
-    }
-
-    /**
-     * Helper method to determine if the device has an extra-large screen. For
-     * example, 10" tablets are extra-large.
-     */
-    private static boolean isXLargeTablet(Context context) {
-        return (context.getResources().getConfiguration().screenLayout
-                & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE;
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
-    public void onBuildHeaders(List<Header> target) {
-        loadHeadersFromResource(R.xml.pref_settings_headers, target);
-    }
-
-    /**
-     * A preference value change listener that updates the preference's summary
-     * to reflect its new value.
-     */
-    private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() {
-        @Override
-        public boolean onPreferenceChange(Preference preference, Object value) {
-            String stringValue = value.toString();
-
-            if (preference instanceof ListPreference) {
-                // For list preferences, look up the correct display value in
-                // the preference's 'entries' list.
-                ListPreference listPreference = (ListPreference) preference;
-                int index = listPreference.findIndexOfValue(stringValue);
-
-                // Set the summary to reflect the new value.
-                preference.setSummary(
-                        index >= 0
-                                ? listPreference.getEntries()[index]
-                                : null);
-
-            } else {
-                // For all other preferences, set the summary to the value's
-                // simple string representation.
-                preference.setSummary(stringValue);
-            }
-            return true;
-        }
-    };
-
-    /**
-     * Binds a preference's summary to its value. More specifically, when the
-     * preference's value is changed, its summary (line of text below the
-     * preference title) is updated to reflect the value. The summary is also
-     * immediately updated upon calling this method. The exact display format is
-     * dependent on the type of preference.
-     *
-     * @see #sBindPreferenceSummaryToValueListener
-     */
-    private static void bindPreferenceSummaryToValue(Preference preference) {
-        // Set the listener to watch for value changes.
-        preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener);
-
-        // Trigger the listener immediately with the preference's
-        // current value.
-        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference,
-                PreferenceManager
-                        .getDefaultSharedPreferences(preference.getContext())
-                        .getString(preference.getKey(), ""));
-    }
-
-    /**
-     * This method stops fragment injection in malicious applications.
-     * Make sure to deny any unknown fragments here.
-     */
-    protected boolean isValidFragment(String fragmentName) {
-        return PreferenceFragment.class.getName().equals(fragmentName)
-                || GamePreferenceFragment.class.getName().equals(fragmentName);
-    }
-
-    /**
-     * This fragment shows general preferences only. It is used when the
-     * activity is showing a two-pane settings UI.
-     */
-    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
-    public static class GamePreferenceFragment extends PreferenceFragment {
-        @Override
-        public void onCreate(Bundle savedInstanceState) {
-            super.onCreate(savedInstanceState);
-            addPreferencesFromResource(R.xml.pref_settings_general);
-            setHasOptionsMenu(true);
-
-
-            PreferenceManager preferenceManager = getPreferenceManager();
-            SharedPreferences sp = preferenceManager.getSharedPreferences();
-
-            if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
-
-                if (sp.getBoolean("pref_dark_mode_setting", false)) {
-                    //TwoStatePreference x = (TwoStatePreference) findPreference("pref_dark_mode_automatically_by_system");
-                    //x.setEnabled(false);
-                    findPreference("pref_dark_mode_automatically_by_system").setEnabled(false);
-                    findPreference("pref_dark_mode_automatically_by_battery").setEnabled(false);
-                } else {
-                    if (sp.getBoolean("pref_dark_mode_automatically_by_battery", false) && sp.getBoolean("pref_dark_mode_automatically_by_system", false) ) {
-                        sp.edit().putBoolean("pref_dark_mode_automatically_by_battery", false).commit();
-                    }
-
-                    findPreference("pref_dark_mode_automatically_by_system").setEnabled(!sp.getBoolean("pref_dark_mode_automatically_by_battery", false));
-                    findPreference("pref_dark_mode_automatically_by_battery").setEnabled(!sp.getBoolean("pref_dark_mode_automatically_by_system", false));
-                }
-
-                // Bind the summaries of EditText/List/Dialog/Ringtone preferences
-                // to their values. When their values change, their summaries are
-                // updated to reflect the new value, per the Android Design
-                // guidelines.
-
-                //bindPreferenceSummaryToValue(findPreference("example_text"));
-                //bindPreferenceSummaryToValue(findPreference("example_list"));
-
-            } 
 
     }
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         int id = item.getItemId();
         if (id == android.R.id.home) {
-                getActivity().finish();
+            finish();
-                //startActivity(new Intent(getActivity(), SettingsActivity.class));
             return true;
         }
         return super.onOptionsItemSelected(item);
     }
+
+
+    public static class SettingsFragment extends PreferenceFragmentCompat {
+        @Override
+        public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+            setPreferencesFromResource(R.xml.pref_settings_general, rootKey);
+            prefScreen = getPreferenceScreen();
+            SharedPreferences preferenceManager = PreferenceManager
+                    .getDefaultSharedPreferences(getActivity());
+            recheckNightModeProperties(preferenceManager);
+
+        }
     }
 }

app/src/main/res/layout/settings_activity.xml

@@ -0,0 +1,9 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <FrameLayout
+        android:id="@+id/settings"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</LinearLayout>

app/src/main/res/values/arrays.xml

@@ -0,0 +1,12 @@
+<resources>
+    <!-- Reply Preference -->
+    <string-array name="reply_entries">
+        <item>Reply</item>
+        <item>Reply to all</item>
+    </string-array>
+
+    <string-array name="reply_values">
+        <item>reply</item>
+        <item>reply_all</item>
+    </string-array>
+</resources>

app/src/main/res/values/strings.xml

@@ -178,5 +178,21 @@
     <string name="verify_custom_sudoku_process_toast">Verifying&#8230;</string>
     <string name="finished_verifying_custom_sudoku_toast">Done verifying!</string>
     <string name="failed_to_verify_custom_sudoku_toast">Verification failed: Your sudoku cannot be solved.</string>
+    <string name="title_activity_settings_new">Settings</string>
+
+    <!-- Preference Titles -->
+    <string name="messages_header">Messages</string>
+    <string name="sync_header">Sync</string>
+
+    <!-- Messages Preferences -->
+    <string name="signature_title">Your signature</string>
+    <string name="reply_title">Default reply action</string>
+
+    <!-- Sync Preferences -->
+    <string name="sync_title">Sync email periodically</string>
+    <string name="attachment_title">Download incoming attachments</string>
+    <string name="attachment_summary_on">Automatically download attachments for incoming emails
+    </string>
+    <string name="attachment_summary_off">Only download attachments when manually requested</string>
 
 </resources>